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Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Deferred tax benefit (expense)	$ (80,150)	$ 299,095	$ (50,984)
Total URA(D) on securities arising during the period	483,817	(228,160)	$ (71,298)
Amortized Cost [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	532,851	(248,568)
Deferred tax benefit (expense)	(49,149)	20,543
Deferred tax benefit (expense), other-than-temporary impairment	115	(135)
Total URA(D) on securities arising during the period	483,817	(228,160)
Amortized Cost [Member] | Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	534,410	(247,497)
Amortized Cost [Member] | Fixed Maturity Securities, Other-Than-Temporary Impairment [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (1,559)	$ (1,071)

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